MD5 Authentication for OSPF Areas

MD5 Authentication for OSPF areas is done on the interface.

Here are a couple of examples:


Area 34 - Between R3 and R4

R3

interface Serial1
ip address 192.168.34.3 255.255.255.0
encapsulation ppp
ip ospf authentication message-digest
ip ospf message-digest-key 1 md5 letme34


Then to match that on R4

interface Serial0
ip address 192.168.34.4 255.255.255.0
encapsulation ppp
ip ospf authentication message-digest
ip ospf message-digest-key 1 md5 letme34
clock rate 4000000
no fair-queue


For ISDN it is done on the Dialer:

R1

ip ospf authentication message-digest
ip ospf message-digest-key 1 md5 letme12
! Suppress the "hello"s to stop the line coming up
ip ospf demand-circuit


R2

ip ospf authentication message-digest
ip ospf message-digest-key 1 md5 letme12
! Suppress the "hello"s to stop the line coming up
ip ospf demand-circuit


Area 0 (Frame Relay)
R1

interface Virtual-Template1
ip unnumbered Serial0/0.123
ip ospf authentication message-digest
ip ospf message-digest-key 1 md5 letme0


R3

interface Virtual-Template1
ip unnumbered Serial0/0.321
ip ospf authentication message-digest
ip ospf message-digest-key 1 md5 letme0